https://bugs.webkit.org/show_bug.cgi?id=118808

Reviewed by Martin Robinson.

Source/WebCore:

When copying an accelerated image, we try to get its dimensions with
cairo_image_surface_get_width/cairo_image_surface_get_height. As
surface is not an image, this returns width and height of 0.

Many other places use cairo_image_surface_get although the surface may
be a gl surface.

This patch fixes those issues by implementing a cairoSurfaceSize
helper that returns the surface size whatever type it is.

It use cairo_surface_create_similar instead of
cairo_image_surface_create in copyCairoImageSurface. It also calls
cairo_paint in encodeImage when a drawing over a black background is
needed.

It copies the surface to an image surface if needed in extractImage.

No new tests. Covered by existing tests.

* platform/graphics/cairo/BitmapImageCairo.cpp:
(WebCore::BitmapImage::BitmapImage):
(WebCore::BitmapImage::draw):
(WebCore::BitmapImage::checkForSolidColor):
* platform/graphics/cairo/CairoUtilities.cpp:
(WebCore::copyCairoImageSurface):
(WebCore::cairoSurfaceSize):
* platform/graphics/cairo/CairoUtilities.h:
* platform/graphics/cairo/GraphicsContext3DCairo.cpp:
(WebCore::GraphicsContext3D::ImageExtractor::extractImage):
* platform/graphics/gtk/GdkCairoUtilities.cpp:
(cairoSurfaceToGdkPixbuf):
* platform/graphics/gtk/GdkCairoUtilities.h:
* platform/graphics/gtk/ImageBufferGtk.cpp:
(WebCore::encodeImage):
* platform/graphics/gtk/ImageGtk.cpp:
(WebCore::BitmapImage::getGdkPixbuf):
* platform/gtk/DragIcon.cpp:
(WebCore::DragIcon::setImage):

Source/WebKit/gtk:

Change cairoImageSurfaceToGdkPixbuf to cairoSurfaceToGdkPixbuf.

* webkit/webkitfavicondatabase.cpp:
(getIconPixbufSynchronously):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154819 268f45cc-cd09-0410-ab3c-d52691b4dbfc